Trying to get wireless connection to iMac from Airport extreme

Hello! I need some help as I am new to mac...
I have a new iMac and bought the airport extreme to connect me wirelessly from cable modem....also have pc hard wired to airport extreme...set everything up and initially connection to both pc and imac.
First time connected to internet with imac.
It wanted some updates done..registered with apple care (i think that is what its called) and then after a couple of hours couldnt connect to wireless internet.
The imac is 2 floors up from airport..thought that was the problem..brought imac to the airport extreme..still no network.
I am missing something and I need some help please!!!
Thanks
Tova

if this doesnt work tell us the details or take a screenshot of the Network preferences window and the TCP/IP tab in the advanced window.

Click to expand...

I did reboot and nothing! I couldn't even get the internet to work on the pc without disconnecting the airport extreme. So i have no idea how to do the screen shot and I the imac won't connect to the net. It did once yesterday when I first plugged in the airport extreme and it went into sleep mode and then internet no more.

Hello! I need some help as I am new to mac...
I have a new iMac and bought the airport extreme to connect me wirelessly from cable modem....also have pc hard wired to airport extreme...set everything up and initially connection to both pc and imac.
First time connected to internet with imac.
It wanted some updates done..registered with apple care (i think that is what its called) and then after a couple of hours couldnt connect to wireless internet.
The imac is 2 floors up from airport..thought that was the problem..brought imac to the airport extreme..still no network.
I am missing something and I need some help please!!!
Thanks
Tova

Click to expand...

There seems to be an issue with the latest Airport Extreme update (06/30/08).

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